Temperature Rankine ↔ Fahrenheit

R = F + 459.67. Rankine is absolute (0 = absolute zero); Fahrenheit + 460.

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How to use this calculator

  • Pick direction.
  • Enter temperature.
  • Read all 4 scales.

About this calculator

Rankine is the absolute version of Fahrenheit (0 °R = absolute zero). 0 °F = 459.67 °R; room temp 70 °F = 530 °R. Used in US/Imperial engineering thermodynamics. Kelvin is the absolute Celsius equivalent. Conversions: 0 K = −273.15 °C = 0 °R = −459.67 °F.

Frequently asked

Why use Rankine?+
Thermo equations need absolute temperature. Engineers using Fahrenheit prefer Rankine to avoid switching to metric.
Difference K vs. R?+
Both absolute. K uses Celsius-sized degrees; R uses Fahrenheit-sized. R = 1.8 K.
When does it matter?+
Gas laws, ideal heat engines, stress-strain temperatures. Anywhere T appears as a multiplier.
Absolute zero?+
0 R = 0 K = -273.15 °C = -459.67 °F. Theoretical lowest temperature; molecules at lowest energy state.
Why is room temp 530 °R?+
70 °F + 459.67 = 529.67 ≈ 530.

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